ZABBIX is an enterprise-class distributed monitoring solution designed to monitor and track performance and availability of network servers, devices, and other IT resources. It supports distributed and Web-based monitoring, auto-discovery, real-time monitoring, SLA assurance, trending, and more.

Performance Co-Pilot (PCP) is a framework and set of services for supporting system-level performance monitoring and performance management. It provides a unifying abstraction for all of the interesting performance data in a system, and allows client applications to easily retrieve and process any subset of that data using a single API. A client-server architecture allows multiple clients to monitor the same host, and a single client to monitor multiple hosts. Archive logging and replay are integrated so that a client application can use the same API to process real-time data from a host or historical data from an archive.

Spinlogs is a shell script for rotating system logs. It is configurable through
a text file similar in format and featureset to the newsyslog program in
FreeBSD. Any Unix system running ksh should be able to use it. There are many
options defining how and when log files should be rotated, and the config file
is very straightforward. Rotating log files is a pretty simple task, but some
commercial platforms don't include anything better than the old "newsyslog", so
this is provided as a system-independent alternative.

ISDN Overview displays a nicely-formatted HTML Table (in German)
showing the last ten in and outgoing ISDN calls, emphasizing the
last unanswered incoming call. It uses the information stored in the
/var/log/isdnlog logfile by the isdn4linux package.

Trace.java is a package used by Java programmers, testers, server administrators and others to understand what happened during the execution of a program. It doesn't generate tracing statements automatically; programmers have to add them. Trace messages go into an in-core ring buffer, a disk log, or both. The disk log can be fixed size with backups. What amount of detail gets logged can be controlled at runtime or launch time. The ring buffer and disk log can be controlled separately. Different subsystems of the code can be controlled independently.

logn (login-notifier) notifies you about logins of other users. It uses the file /var/log/wtmp for this task and scans this file for login of users. When someone logs in (e.g., using ssh, telnet or FTP) an informational line about the login is printed on your console. To ease idling around on a remote machine with firewall/NAT between you and the remote machine, logn outputs an ASCII NUL character every 8 minutes.

RadiusSplit is a Perl program designed to take, as
input, one or more large RADIUS accounting "detail"
log files, and split them out into individual files -
one per user. The net result is that you will have a
detail file per user, which can be passed to other
RADIUS parsing logfile analysers (e.g. RadiusReport)
so they run much faster (usually be a factor of
several hundred), since they don't have to parse
and discard the non-relevant data.